Advertising display unit



FIG. 1 is a front elevational view of an advertising display unit, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view thereof, with additional units shown in broken lines for illustrative purposes. 

The ornamental design for an advertising display unit, as shown and described. 